Which of the following is not a method used in measuring DG COMM's effectiveness?

Measuring the effectiveness of DG COMM involves assessing various indicators that reflect its communication impact and reach. The total number of visits to the EUROPA.eu website provides direct insight into user engagement, while survey results from Eurobarometer offer valuable data on public opinion and awareness regarding the EU. Public perception data on the EU reflects how well DG COMM's messaging resonates with the general population.

However, the amount of press material released does not directly correlate with the effectiveness of the communication. Simply producing and distributing material does not necessarily indicate that the communication is being effective or well-received. Effectiveness is better gauged through metrics that track engagement and public perception rather than just the volume of material generated. Thus, this choice stands out as not being a method used in measuring the true effectiveness of DG COMM's efforts.